LCD wiki E32R28T 2.8inch ESP32-32E Nuni Module Manual

Jagorar albarkatun ya ƙunshi sample programs, software libraries, product specifications, structure diagrams, datasheets, schematics, user manuals, and tool software.
Wannan sashe yana ba da ƙarewaview of the hardware resources available on the module.

Explains the schematic diagram of the display module in detail.
Provides precautions to be taken while using the display module.

Bayanin albarkatu

Ana nuna kundin adireshi a cikin adadi mai zuwa:

Jagora	Bayanin Abun ciki
1-Demo	A sampLe program code, ɗakin karatu na software na ɓangare na uku wanda sampshirin ya dogara da, maye gurbin ɗakin karatu na software na ɓangare na uku file, daftarin aiki na saitin ci gaban software, da sample program instruction daftarin aiki.
2-Ƙayyadaddun bayanai	Nuni samfurin ƙayyadaddun samfur, ƙayyadaddun allo na LCD da lambar ƙaddamarwa direba IC LCD nuni.
3-Tsarin_Tsarin	Nuna girman samfurin samfurin da zanen 3D na samfur
4-Takardar bayanai	LCD nuni direban ILI9341 littafin bayanai, juriya tabawa direba XPT2046 data littafin, ESP32 master data littafin da hardware zane daftarin aiki, USB zuwa Serial IC(CH340C) bayanai littafin, audio littafin amplifier chip FM8002E data book, 5V to 3.3V regulator data book and battery charge management Chip TP4054 data sheet.
5-Tsarin tsari	Product hardware schematic, ESP32-WROOM-32E module IO resource allocation table, schematic, and PCB component package
6-Mai amfani_Manual	Takardun mai amfani da samfur
7-Tool_software	WIFI da Bluetooth sun gwada APP da kayan aikin gyarawa, USB zuwa direban tashar jiragen ruwa, ESP32 Flash download kayan aikin software, software mai ɗaukar hoto, software na ɗaukar hoto, software na sarrafa hoto JPG and serial port debugging tools.
8-Saurin_Farawa	Need to burn the bin file, flash the download tool, and use the instructions.

Umarnin Software

Matakan haɓaka software na nuni sune kamar haka:

A. Gina ESP32 dandali na ci gaban software.

B. If necessary, import third-party software libraries as a basis for development;
C. Open the software project to be debugged, or you can also create a new software project.

D. power on the display module, compile and download the debugging program, and then check the software running effect.
E. The software effect does not reach the expected, continue to modify the program code, and then compile and download, until the effect reaches the expected.
For details about the preceding steps, see the documentation in the 1 Demo directory.

Umarnin Hardware

Ƙarsheview of the module’s hardware resources is displayed

Ana nuna albarkatun kayan masarufi a cikin adadi biyu masu zuwa:

An bayyana albarkatun kayan aikin kamar haka:

LCD

The LCD display size is 2.8 inches, the driver IC is ILI9341, and the resolution is 24 0x 32 0. The ESP32 is connected using a 4-wire SPI communication interface.
A. Introduction to ILI9341 controller The ILI9341 controller supports a maximum resolution of 240*320 and a 172800-byte GRAM. It also supports 8-bit, 9-bit, 16-bit, and 18-bit parallel port data buses. It also supports 3-wire and 4-wire SPI serial ports. Since parallel control requires a large number of I/O ports, the most common one is SPI serial port control. The ILI9341 also supports 65K, 262K RGB color display, display color is very rich, while supporting rotating display and scroll display and video playback, and displaying in a variety of ways.

Mai sarrafa ILI9341 yana amfani da 16bit (RGB565) don sarrafa nunin pixel, don haka zai iya nuna har zuwa launuka 65K akan kowane pixel. Ana yin saitin adireshin pixel a cikin jeri na layuka da ginshiƙai, kuma yanayin haɓakawa da ragewa yana ƙayyade ta yanayin dubawa. Ana yin hanyar nunin ILI9341 ta saita adireshin sannan saita ƙimar launi.
B. Gabatarwa ga ka'idar sadarwa ta SPI

Yanayin rubutu na bas SPI mai waya 4 ana nuna shi a cikin adadi mai zuwa:

CSX zaɓin guntu na bawa ne, kuma guntu za a kunna shi ne kawai lokacin da CSX ya kasance a ƙaramin ƙarfi.
D/CX shine fil ɗin sarrafa bayanai/ umarni na guntu. Lokacin da DCX ke rubuta umarni a ƙananan matakai, ana rubuta bayanai a manyan matakai

SCL is the SPI bus clock, with each rising edge transmitting 1 bit of data.
SDA shine bayanan da SPI ke watsawa, wanda ke watsa bayanai guda 8 a lokaci guda. Ana nuna tsarin bayanan a cikin adadi mai zuwa:

Babban bit farko, watsa farko.
Don sadarwar SPI, bayanai suna da lokacin watsawa, tare da haɗin lokaci na lokaci-lokaci (CPHA) da polarity clock (CPOL):
Matsayin CPOL yana ƙayyade matakin halin rashin aiki na agogon serial synchronous, tare da CPOL=0, yana nuna ƙaramin matakin. CPOL Biyu watsa yarjejeniya
The discussion did not have much influence.
Tsayin CPHA yana ƙayyade ko agogon serial synchronous yana tattara bayanai a gefen tsalle na farko ko na biyu,
Lokacin da CPHL = 0, yi tarin bayanai a farkon canjin canji;
Haɗin waɗannan biyun ya zama hanyoyin sadarwa na SPI guda huɗu, kuma SPI0 ana amfani da ita a China, inda CPHL=0 da CPOL=0

ESP32 WROOM 32E M odule

This module has a built-in ESP32-DOWD-V3 chip, an Xtensa dual-core 32-bit LX6 microprocessor, and supports clock rates up to 240MHz. It has 448KB ROM, 520KB SRAM, 16KB RTC SRAM, and 4MB QSPI Flash. 2.4GHz WIFI,
Bluetooth V4.2 and Bluetooth Low Power modules are supported. External 26 GPIOs, support SD card, UART, SPI, SDIO, I2C, LED PWM, motor PWM, I2S, IR, pulse counter, GPIO, capacitive touch sensor, ADC, DAC, TWAI and other peripherals.

Slot na MicroSD

Amfani da yanayin sadarwa na SPI da haɗin ESP32, goyan bayan katunan MicroSD na iyakoki daban-daban.

RGB Three color Light

Red, green, and blue LED lights can be used to indicate the running status of the program.

Serial Port

Ana amfani da tsarin tashar tashar jiragen ruwa na waje don sadarwar tashar tashar jiragen ruwa.

USB to Serial Port and One-click Download Circuit

Babban na'urar ita ce CH340C, ana haɗa ƙarshen ɗaya zuwa kwamfutar USB, ƙarshen ɗaya yana haɗa zuwa tashar tashar ESP32, don cimma tashar tashar USB zuwa TTL.
In addition, a one-click download circuit is also attached, so that is, when downloading the program, it can automatically enter the download mode, without the need to touch the external.

Interface na baturi

Two-pin interface, one for the positive electrode, one for the negative electrode, to access the battery power supply and charging.

Battery Charge and Discharge Management Circuit

The core device is TP4054, this circuit can control the battery charging current, the battery is safely charged to saturation state, but can also safely control the battery discharge.

Maɓallin BOOT

Bayan an kunna samfurin nuni, dannawa zai rage IO0. Idan lokacin da aka kunna tsarin ko aka sake saitin ESP32, rage IO0 zai shiga yanayin zazzagewa. Wasu lokuta ana iya amfani da su azaman maɓalli na yau da kullun.

Interface Type-C

The main power supply interface and program download interface of the display module. Connect the USB to a serial port and a one-click download circuit, can be used for power supply, download and serial communication.

5V zuwa 3.3V Voltage Regulator Circuit

The core device is the ME6217C33M5G LDO regulator.

Voltage regulator circuit supports 2A V~6.5V wide voltage input, a 3.3V stable voltage fitarwa, kuma matsakaicin fitarwa na halin yanzu shine 800mA, wanda zai iya cika juzu'itage da bukatun halin yanzu na ƙirar nuni.

Sake saitin Maɓalli

Bayan an kunna tsarin nunin, latsawa zai ja maɓallin sake saiti na ESP32 ƙasa (tsarin yanayin yana jan sama), don cimma aikin sake saiti.

Resistive Touch Screen Control Circuit

Babban na'urar ita ce XPT2046, wacce ke sadarwa tare da ESP32 ta hanyar SPI.
Wannan kewayawa ita ce gada tsakanin allon taɓawa mai tsayayya da maigidan ESP32, wanda ke da alhakin watsa bayanan akan allon taɓawa zuwa maigidan ESP32, ta yadda za a sami haɗin kai na wurin taɓawa.

Fadada fil

An input IO port, GND, and 3.3V pin that are not used on the ESP32 module are led out for peripheral use.

kewaye kula da hasken baya

The core device is a BSS138 field-effect tube.
One end of this circuit is connected to the backlight control pin on the ESP32 master, and the other end is connected to the negative pole of the LCD screen backlight LED lamp.
Backlight control pin pull up, back light, otherwise off.

Mai magana da magana

Dole ne a haɗa tashoshin wayoyi a tsaye. Ana amfani da su don samun damar lasifika da lasifika.

Ƙarfin sauti ampkewaye kewaye

Babban na'urar ita ce sautin FM8002E ampFarashin IC.
One end of this circuit is connected to the ESP32 audio DAC value output pin and the other end is connected to the horn interface.
The function of this circuit is to drive a small power horn or speaker to sound. For 5V power supply, the maximum drive power is 1.5W (load 8 ohms) or 2W (load 4 ohms).

SPI na gefe dubawa

4-waya kwance ke dubawa. Fitar da fil ɗin zaɓin guntu da ba a yi amfani da shi ba da SPI ke dubawa wanda katin MicroSD ke amfani da shi, wanda za'a iya amfani dashi don na'urorin SPI na waje ko na yau da kullun na IO.

Detailed explanation of the schematic diagram of the display module

Type C interface circuit

A cikin wannan da'irar, D1 shine Schottky diode, wanda ake amfani dashi don hana halin yanzu daga juyawa. D2 zuwa D4 diodes ne na kariyar hawan lantarki don hana tsarin nunin lalacewa saboda wuce gona da iritage or short circuit. R1 is the pull-down resistance. USB1 is a Type-C bus. The display module connects to Type C power supply, downloads programs, and communicates through the USB 1. Where +5V and GND are positive power voltage and ground signals USB_D and USB_D+ are differential USB signals, which are transmitted to the onboard USB to serial circuit.

5V zuwa 3.3V voltage regulator circuit

A cikin wannan da'irar, C16 ~ C19 ita ce capacitor fil fil, wanda ake amfani dashi don kula da kwanciyar hankali na shigarwar vol.tage da fitarwa voltage. The U1 is a 5V to 3.3V LDO with the model number ME6217C33M5G. Because most of the circuits on the display module need a 3.3V power supply, and the power input of the Type Cinterface is basically 5V, so a voltagAna buƙatar da'irar juyawa mai gudanarwa.

Resistive touch allon kula da kewaye

A cikin wannan da'irar, C25 da C27 sune masu ƙarfin tacewa ta hanyar wucewa, waɗanda ake amfani da su don kula da shigar vol.tage stability. R22 is a pull-up resistor used to maintain the default pin state as high. U4 is the XPT2046 control IC, The function of this IC is to obtain the coordinate voltage value of the touch point of the resistance touch screen through X+, X –, Y+, and Y four pins, and then through ADC conversion, the ADC value is transmitted to the ESP32 master. The ESP32 master then converts the ADC value to the pixel coordinate value of the display. The PEN pin is a touch interrupt pin, and the input level is low when a touch event occurs.

USB to serial port and one-click download circuit

A cikin wannan kewaye, U3 shine CH340C USB-to-serial IC, wanda baya buƙatar oscillator crystal na waje don sauƙaƙe ƙirar kewaye. C6 shine madaidaicin tacewa ta hanyar wucewa da ake amfani dashi don kula da shigar voltage stability. Q1 and Q2 are NPN-type triodes, and R6 and R7 are triode base limiting current resistors. The function of this circuit is to realize to USB-to-serial port and a click download function. The USB signal is input and output through UD+ and UD pins, and is transmitted to the ESP32 master through RXD and TXD pins after conversion. One-click download circuit principle:

A. RST da DTR fil na CH340C babban matakin fitarwa ta tsohuwa. A wannan lokacin, Q1 da Q2 triode ba su kunne, kuma IO0 fil da sake saiti na babban iko na ESP32 ana ja su zuwa babban matakin.
B. RST da DTR fil na CH340C fitarwa ƙananan matakan, a wannan lokacin, Q1 da Q2 triode har yanzu ba a kunne ba, kuma IO0 fil da sake saiti na babban iko na ESP32 har yanzu ana ja su zuwa manyan matakai.
C. The RST pin of CH340C remains unchanged, and the DTR pin outputs a high level. At this time, Q1 is still cut off, Q2 is on, the IO0 pin of the ESP32 master is still pulled up, the reset pin is pulled down, and the ESP32 enters the reset state.

D. CH340C's RST fil yana fitar da babban matakin, DTR fil yana fitar da ƙaramin matakin, a wannan lokacin Q1 yana kunne, Q2 yana kashe, sake saitin fil na ESP32 main control ba zai yi sauri ba ely ya zama babba saboda ana cajin capacitor da aka haɗa, ESP32 har yanzu yana cikin yanayin sake saiti, kuma IO0 fil ɗin nan take zazzage shi zai shiga, a wannan lokacin zazzagewa.

Ƙarfin sauti ampkewaye kewaye

In this circuit, R23, C7, C8, and C9 constitute the RC filter circuit, and R10 and R13 are the gain-adjusting resistors of the operational amplififi. Lokacin da ƙimar juriya na R13 ba ta canzawa, ƙarami ƙimar juriya na R10, mafi girman ƙarar mai magana ta waje. C10 da C11 su ne masu shigar da haɗin kai. R11 shine resistor mai cirewa. JP1 ita ce tashar ƙaho/lasifika. U5 shine FM8002E ƙarfin sauti ampFarashin IC. Bayan shigar da AUDIO_IN, siginar DAC mai jiwuwa ita ce amplified by the FM8002E gain and output to the speaker/speaker by the VO1 and VO2 pins. SHUTDOWN is the enable pin for FM8002E. The low level is enabled. By default, the high level is enabled.

ESP32 WROOM 32E main control circuit

In this circuit, C4 and C5 are bypass filter capacitors, and U2 are ESP32 WROOM 32E modules. For details about the internal circuit of this module, please refer to the official documentation.

Maɓallin sake saitin kewayawa

A cikin wannan da'irar, KEY1 shine maɓalli, R4 shine resistor-up, kuma C3 shine capacitor na jinkiri. Sake saitin ƙa'ida:

A. After powering on, C3 charges. At this time, C3 is equivalent to a short circuit, the RESET pin is grounded, and ESP32 enters the reset state.
B. Lokacin da aka caje C3, C3 yayi daidai da buɗe da'ira, RESET fil yana jan sama, an gama saitin ESP32, kuma ESP32 yana shiga yanayin aiki na yau da kullun.

C. Lokacin da aka latsa KEY1, fil ɗin RESET yana ƙasa, ESP32 yana shiga yanayin sake saiti, kuma ana fitar da C3 ta hanyar KEY1.
D. Lokacin da aka fito da KEY1, ana caje C3. A wannan lokacin, C3 yayi daidai da gajeriyar kewayawa, RESET fil yana ƙasa, ESP32 har yanzu yana cikin yanayin SAKETA. Bayan cajin C3, fil ɗin sake saiti yana ja sama, an sake saitin ESP32 kuma ya shiga yanayin aiki na yau da kullun.

Idan Sake saitin bai yi nasara ba, ƙimar haƙurin C3 za a iya ƙarawa yadda ya kamata don jinkirta ƙaramar matakin matakin sake saitin fil.

Interface circuit of the serial module

A cikin wannan da'irar, P2 shine wurin zama na 4P 1.25mm, R29 da R30 sune masu tsayayyar ma'auni na impedance, kuma Q5 shine bututun tasirin filin da ke sarrafa isar da wutar lantarki ta 5V.

R31 is a pulldown resistor. Connect RXD0 and TXD0 to serial pins, and supply power to the other two pins. This port is connected to the same serial port as the onboard USB-to-serial port module.

EX pand IO and peripheral interface circuits

In this circuit, P3 a nd P4 are 4P 1.25mm pitch seats. SPI_CLK, SPI_MISO, and SPI_MOSI pins are shared with the MicroSD card SPI pins. Pins SPI_CS, IO35 are not used by on board devices, so they are led out to connect SPI, and can also be used for ordinary IO. Things to watch out for:

A. IO35 can only be input pins.

Cajin baturi da kewaye sarrafa fitarwa

In this circuit, C20, C21, C22, and C23 are bypass filter capacitors. U6 is the TP4054 battery charge management IC. R27 regulates the battery charging current. JP2 is a 2P 1.25mm pitch seat, connected to a battery. Q3 is a P-channel FET. R28 is the Q3 grid pull-down resistor. TP4054 charges the battery through the BAT pin; the smaller the R27 resistance, the larger the charging current, with a maximum is 500mA. Q3 and R28 together constitute the battery discharge circuit, When there is no power supply through the Type C interface, the +5V voltage is 0, then the Q3 gate is pulled down to a low level, the drain and the source are on, and the battery supplies power to the entire display module. When powered through the Type C interface, the +5V voltage shine 5V, sannan ƙofar Q3 tana da ƙarfin 5V, an yanke magudanar ruwa da tushen, kuma an katse wutar lantarki.

1 8P LCD panel wire welding interface

A cikin wannan da'irar, C24 shine madaidaicin tacewa, kuma QD1 shine 48P 0.8mm farar ruwa crystal allon waldawa. QD1 yana da siginar siginar allo na juriya, allon LCD voltage fil, fil ɗin sadarwa na SPI, fil ɗin sarrafawa da fil ɗin kewayawa na baya. ESP32 yana amfani da waɗannan fil don sarrafa LCD da allon taɓawa.

Download the key circuit

In this circuit, KEY2 is the key and R5 is the pull up resistor. IO0 is high by default and low when KEY2 is pressed. Press and hold KEY2, power on or reset, and the ESP32 will enter download mode. In other cases, KEY2 can be used as a normal key.

Da'irar gano ƙarfin baturi

A cikin wannan da'irar, R2 da R3 suna partal voltage resistors, da C1 da C2 sune masu iya tacewa. Baturin voltage BAT+ shigar da siginar yana wucewa ta cikin resistor resistor. BAT_ADC shine voltage value at both ends of R3, which is transmitted to the ESP32 master through the input pin and then converted by ADC to finally obtain the battery voltage daraja. VoltagAna amfani da mai rarrabawa saboda ESP32 ADC yana canza matsakaicin 3.3V, yayin da jikewar baturi vol.tage shine 4.2V, wanda ba shi da iyaka. The samu voltage ninka ta 2 shine ainihin baturin voltage.

LCD kula da hasken baya

A cikin wannan da'irar, R24 shine juriya na gyara kuskure kuma ana riƙe shi na ɗan lokaci. Q4 shine bututun tasirin filin N-channel, R25 shine juzu'i na grid Q4, kuma R26 shine mai iyakance hasken baya na yanzu. Hasken baya na LCD LED lamp yana cikin yanayin layi ɗaya, madaidaicin sanda yana haɗa zuwa 3.3V, kuma an haɗa sandar mara kyau zuwa magudanar Q4. Lokacin da ikon sarrafawa LCD_BL yana fitar da babban voltage, the drain and source poles of Q4 are switched on. At this time, the negative pole of the LCD backlight is grounded, and the backlight LED lamp yana kunna kuma yana fitar da haske.
When the control pin LCD_BL outputs a low voltage, an yanke magudanar ruwa da tushen Q4, kuma an dakatar da hasken baya mara kyau na allon LCD, kuma hasken baya LED l.amp ba a kunna. Ta tsohuwa, hasken baya na LCD yana kashe.

Rage juriya na R26 na iya ƙara matsakaicin haske na hasken baya.
In addition, the LCD_BL pin can input a PWM signal to adjust the LCD backlight.

RGB mai sarrafa haske mai launi uku

A cikin wannan kewaye, LED2 RGB ne mai launi uku lamp, kuma R14 ~ R16 ne mai launi uku lamp current limiting resistor.
LED2 contains red, green, and blue LED lights, which are common anode connections.

IO16, IO17 and IO22 are three control pins, which light up LED lights at low level and extinguish the LED lights at high level.

MicroSD katin Ramin dubawa kewaye

A cikin wannan da'irar, SD_CARD1 shine ramin katin MicroSD. R17 zuwa R21 sune resistors masu ja don kowane fil. C26 shine capacitor tacewa. Wannan kewayon keɓancewa yana ɗaukar yanayin sadarwa na SPI. Yana goyan bayan ajiya mai sauri na katunan MicroSD.
Lura cewa wannan keɓancewa yana raba bas ɗin SPI tare da keɓantawar SPI.

Kariya don amfani da module nuni

The display module is charged with the battery, the external speaker plays the audio, and the display screen is also working; at this time, the total current may exceed 500mA. In this case, you need to pay attention to the maximum current supported by the Type C cable and the maximum current supported by the power supply interface to avoid an insufficient power supply.

Lokacin amfani, kar a taɓa LDO voltage mai tsarawa da sarrafa cajin baturi IC tare da hannuwanku don gujewa konewa ta yanayin zafi.
Lokacin haɗa tashar tashar IO, kula da yadda ake amfani da IO don guje wa rashin haɗin kai kuma ma'anar lambar shirin ba ta dace ba.
Yi amfani da samfurin a amince da hankali.

FAQ

Tambaya: Ta yaya zan shiga cikin sampda shirye-shirye da ɗakunan karatu na software?
- A: A sample programs and libraries can be found in the 1-_Demo directory of the resource description.
Tambaya: Wadanne kayan aiki ne aka haɗa a cikin software na kayan aiki?
- A: The tool software includes WIFI and Bluetooth test APP, debugging tools, USB to serial port driver, ESP32 Flash download tool software, character take-up software, image take-up software, JPG image processing software, and serial port debugging tools.

Takardu / Albarkatu

LCD wiki E32R28T 2.8inch ESP32-32E Nuni Module [pdf] Manual mai amfani
E32R28T, E32N28T, E32R28T 2.8inch ESP32-32E Nuni Module, E32R28T, 2.8inch ESP32-32E Nuni Module, ESP32-32E Nuni Module, Nuni Module, Module

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LCD wiki E32R28T 2.8inch ESP32-32E Nuni Module

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